“The program is voluntary, and the number of companies that will participate or how effective the program will be remains unclear.
Companies have long been reluctant to acknowledge security failures. As of Thursday, about six organizations had signed up and others have expressed interest, Andy Ozment, the assistant cybersecurity secretary at Homeland Security, said. The names of companies participating are closely held, and records about their involvement are exempt from disclosure under the Freedom of Information Act.”
Source: Homeland Security Begins Sharing Cyberthreats With Business – ABC News